ES2308321T3 - MOTORCYCLE. - Google Patents

Abstract

The present invention relates to a motorcycle comprising an engine (1); an intake passage which extends rearwardly, and obliquely upwardly from the engine; an intake box (12) which is connected to the intake passage and is arranged above the engine (1); a fuel tank (10) which includes a front wall arranged behind the intake box (12) and the intake passage in a side view; an injector (26) which is mounted on the intake box (12); and a fuel pipe (39) which supplies fuel to the injector (26); wherein a portion of the fuel pipe (39) is arranged to extend in the vertical direction in a space between the intake box (12) and the front wall of the fuel tank (10).

Description

Motorcycle.

The present invention relates to a motorcycle having the characteristics of claim 1, in  particular a motorcycle comprising a cylinder engine multiple, such as a high performance motor suitable for racing, in particular a parallel four-cylinder engine of the water-cooled type and, in particular, refers to a fuel supply device for it.

Conventionally, as a high engine performance, such as an engine mounted on a motorcycle racing, an engine has been known that includes two injectors in one admission step of each cylinder to further increase the maximum output These injectors are arranged in a throttle valve device, which is connected to a cylinder head by means of a rubber gasket, for example, and in the proximity of an air channel that is directed to the side inside a filter box connected to an upstream side of the throttle valve device.

The injector mounted on the valve device throttling is referred to as a primary injector to continuation and the injector provided in the vicinity of the channel Air is referred to as a secondary injector onwards. Although the most primary injectors inject fuel through a total range of a rotating motor region, some primary injectors stop the injection after it has been performed the injection of the secondary injector. Injector secondary injects fuel when the rotating region of the engine It is in high load time, such as high rotating region or in the fast acceleration time.

Among these injectors, the secondary injector is supported by a mounting piece, such as a support column, which extends inside a filter box of air from a throttle valve device and three members of paras that extend to the upstream side of admission from an open end portion of the air channel, in which a secondary injector shaft is arranged substantially parallel to a central axis of a passage of admission into the air channel.

However, the delivery device of fuel of a conventional motorcycle engine that has a constitution of this type has a disadvantage in the structure to support the secondary injector. This inconvenience is attributed to the fact that column brackets and members of legs are used to retain the secondary injector, so to speak So, "in the air."

That is, due to the provision of these assembly parts, the weight of the body of an motorcycle and manufacturing cost rises. In addition, when Remove the air filter housing and the valve device from strangulation of the motorcycle body to perform the engine maintenance, mounting parts must be removed mentioned above every time the filter case is removed of air and the throttle valve device and, so therefore, labor hours are increased.

In addition, it is necessary to form a slack between Mounting parts and air filter housing to prevent that the mounting parts and the air filter housing enter contact with each other and therefore there is also the inconvenience that the air filter case is large sized. Here, when the air filter case is inserted in a portion recessed inside the fuel tank, when the air filter is large sized, this reduces the capacity of the fuel tank.

In addition, since the mounting parts mentioned above are present in a flow step of entrance through which an intake air circulates within the air channel, the admission is interrupted by these pieces, of so that there is also the disadvantage that the resistance when the intake air circulates.

In addition, it is known from JP 55-012262 an internal combustion engine with intake and exhaust valves, which have an air inlet common, which is divided into several air intake steps that lead to the respective intake valves of the cylinders respective. A fuel injector is provided for inject fuel into the common air inlet, where the mixture of air / fuel is then divided for the intake steps of respective air leading to the cylinders.

Additionally, the JP document 2000-097131 describes an internal combustion engine which has primary and secondary injectors. Primary injector injects fuel downstream of the throttle valve and the secondary fuel injector is arranged in the portion of the opening end of an air channel representing the introductory portion of the air intake passage, in which it is throttle valve installed. Here the injector secondary fuel is mounted on a supported clamp in the air channel.

The present invention has been made for solve these drawbacks and an object of the present invention  is to provide a motorcycle and a motorcycle engine with a supply device that has a structure simplified

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This objective is solved in a way inventive for a motorcycle that has the characteristics of the claim 1.

Preferred embodiments are shown in the dependent claims

Preferably, said fuel injector you are mounted on a cover body of the intake box and a advantageously way is mounted on a wall that is directed towards the extreme opening portion of the intake passage in the box admission or silent admission.

According to an embodiment preferred, said fuel injector is mounted in the box of admission through a support structure and in a way preferred said intake box is mounted in a portion end of the upstream side of a valve device constriction.

According to a beneficial design, a fuel tank is arranged behind and adjacent to the box of admission that has a space there in the middle defined by a portion of wall projected up from the tank fuel, wherein said fuel tank overlaps a preferred manner said intake box.

It is preferred that the fuel injector be replaceable with respect to a bottom wall of the box admission, which penetrates the admission step and when preferably an upper surface of the fuel tank is substantially smooth and is arranged at a higher level than that of the admission box.

In an advantageous manner, the deposit of fuel comprises a recess portion defined by a portion  projected up the bottom wall to house there the admission box

Preferably, said admission box it comprises a cover body on which said injector is mounted, each with an intake passage leading to a respective cylinder, and a box body penetrated from below by admission steps respective, said lid and case bodies being molded to from fiber reinforced plastic material and connected from detachable form each other.

According to an embodiment preferred, the intake box comprises a lid body in which  the fuel injector that closes an opening of an upper end portion of a box body mounted on a throttle valve device.

Preferably, the cover body and the body of box of the admission box are formed in such a way that with with respect to both movements in a lateral direction and in a vertical direction are restricted to each other, forming a Smooth adjustment portion.

According to a preferred design, the fuel supply device for each cylinder comprises a primary injector mounted on a valve device of throttling and a secondary injector mounted on a lid body of an intake box, a set being provided of fuel pipe that is adapted to supply fuel from a fuel tank to these injectors of fuel.

In a preferred way, the intake box It is folded flat in a forward direction.

It is preferred that an air filter element is arranged in a front portion inside a box body of the admission box.

Therefore, preferably, the present invention comprises a fuel supply device that includes, for each cylinder, a primary injector, mounted on a throttle valve device and an injector secondary, mounted on a cover body of an intake box, in which opens an end portion of respective opening for each cylinder to adopt a position opposite to the secondary injector respectively, said primary injectors are supplied by a common fuel rail and said secondary injectors are supplied by a common fuel rail connected by a connector tube that extends vertically, which extends from above behind the admission box.

In addition, the connector tube is advantageously extends in the vertical direction in the space between the box of admission and fuel tank.

Preferably, the fuel pipe of connection is interposed between the upper and lower rails of fuel by means of couplers that can be mounted and disassemble without the use of a tool.

Alternatively, the tube of connection fuel is coupled to the upper rails and lower fuel by additional pipe.

Preferably, the primary injectors they supply fuel over the entire area of the rotating region of the engine, while the secondary injectors supply fuel when the rotating region of the engine is loaded high, such as region of high rotation or rapid acceleration only.

According to another favorable aspect, the primary injectors are mounted on a rear side wall of the throttle valve device, injecting fuel to the downstream side of a valve respective strangulation.

In addition, a top rail of fuel is extends in a direction the width of the motorcycle and the Lower fuel rail extends in one direction of the width of the motorcycle under a rear wall of the body of the intake box, connecting the primary injectors, respectively.

Preferably, the support structure, in particular mounting members, of the secondary injectors are attached with bolts to the upper body wall higher.

Preferably, the injector is arranged and is mounted in close proximity to the extreme opening position of the intake passage of each engine cylinder.

It is preferable that an injector shaft arranged in the opening end portion of the intake passage be located substantially parallel to a central line of the admission step.

The extreme opening portion of the passage of admission is made to look inside a box of admission or a silent admission.

There, the injector is mounted in the box admission or the silent admission.

Additionally, the injector may be mounted on a wall that faces the opening end portion of the admission step in the intake box or the intake silencer in an opposite way.

In an advantageous manner, the injector is replaceable with respect to a wall that penetrates the passage of admission.

According to an embodiment preferred, an air channel that constitutes the extreme portion of admission passage opening is directed towards the inside of the intake silencer or to an air filter box that constitutes the intake box, and a secondary injector that constitutes the injector is mounted on the air filter box or the intake silencer.

In addition, it is also beneficial that the injector be mounted in the intake box or in the intake silencer by means of a clamp, said clamp having a step of inside fuel adapted to supply fuel to the injector.

In accordance with yet another embodiment preferred, another injector is provided which is mounted on a engine throttle valve device.

The object of the present invention is resolved, in addition, in an inventive way by means of a motorcycle engine  which has a fuel supply device as it has specified above. There, said engine can be an engine of high performance, such as an engine mounted on a motorcycle racing, in particular a parallel four-cylinder engine Water cooled type.

The present invention is described below. in more detail regarding various embodiments of the same in combination with the accompanying drawings, in the that:

Figure 1 is a side view of a fuel supply device according to a form of realization.

Figure 2 is a view showing a part essential of the fuel supply device in a way expanded; Y

Figure 3 is a plan view of the fuel supply device.

An embodiment of a device Fuel supply of a motorcycle engine is shown in detail in figures 1 to 3. There, figure 1 is a view side of a fuel supply device according with this embodiment and figure 2 is a view showing an essential part of the fuel supply device of an enlarged manner, in which figure 2 illustrates a box of air filter and an extreme portion upstream of a throttle valve device in one state disrupted. Figure 3 is a plan view of the device Fuel supply.

In these drawings, the number 1 indicates a motor of a motorcycle according to this embodiment. This Engine 1 is a parallel four-cylinder engine of the type water cooled and is mounted on a motorcycle chassis 3 in a state in which the cylinders 2 are inclined in the forward direction. The cylinder 2 is constituted by a cylinder body 5 projecting obliquely upwards towards a front side of a sane from a crankcase 4, a cylinder head 6 mounted on an upper end position of the cylinder body 5, a cylinder head cover 7 that is mounted on an end portion upper of cylinder head 6 and the like.

With respect to cylinder head 6, an exhaust pipe does not shown in the drawing is connected to a wall on the front side of the body thereof and at the same time an intake device 8, described below, is connected to a wall on the back side of the body of the same.

As it is known very conventionally, in the chassis 3 shown above, a pair of deposit rails 9 (left and right) extend backward and downward from a header tube not shown in the drawing and a reservoir of Fuel 10 (see Figure 1) is supported on the rails of the tank 9. In this fuel tank 10, a portion recess 11, which opens downwards, is formed in a portion lower of the front side of the body of the same. This portion recess 11 is formed such that a portion of a wall bottom of the fuel tank 10 can be projected towards above to accommodate an air filter box 12 of the device Admission 8 there.

The intake device 8 is constituted by a throttle valve device 14 for each cylinder, which is connected to the cylinder head 6 by means of a gasket rubber 13, the air filter case 12 mentioned above which is mounted on the extreme portion of the upstream side of the throttle valve device 14 and the like.

The throttle valve device 14 it is formed in such a way that an intake passage formed in the inner side of the throttle valve device 14 is extends obliquely and linearly and upward to the rear side of the motorcycle body. The valve device throttling 14 includes a throttling valve of the type of slide 14a. In addition, the valve device throttling 14 is arranged in a defined space between a pair of left and right lanes of the tank 9, 9.

On an extreme portion upstream of the throttle valve device 14, as shown in Figure 2, an air channel 21, which constitutes an extreme portion open of the intake passage according to the present invention is mounted in such a way that the air channel 21 is directed into the air filter case 12 from below.

The mentioned air filter box 12 previously it is constituted, as shown in figures 1 and 2, by a box body 22 in the form of a box which is mounted on a throttle valve device 14 and a body of lid 23 closing an opening of an upper end portion of the box body 22. In addition, a flatter form of the filter box of air 12 is formed, as shown in figure 3, in a semicircular shape folded in the front direction. A box of admission in accordance with the present embodiment is constituted by this air filter box 12.

In the case body 22, a bottom of the side rear of the body of the same is mounted on the device throttle valve 14 and an intake duct 24, which is extends obliquely and down towards the front side of the motorcycle body, is integrally formed on the extreme portion of the front side of the motorcycle body (see figure 1). In addition, in a portion of connection with the intake duct 24, which is arranged in a front portion inside the body of the box 22, an element of air filter not shown in the drawing.

When the box body 22 is mounted on the throttle valve device 14, as shown in Figure 2, this embodiment adopts a structure in the that a bottom wall 22a of the box body 22 is overlapped by an upper end portion of the valve device of throttling 14 and the bottom wall 22a is pushed towards the side of the case body 22 by a flange 21a mounted on a air channel 21 that is screwed into the valve device of strangulation 14.

The cover body 23 is formed by a lid configuration that opens down and is mounted from so that it can be replaced on the case body 22 by means of a coupling member, such as a rubber tape not shown in the drawing in a state in which the cover body 23 covers an open portion formed on an upper end of the box body 22. On an extreme portion of the upper wall 23a of the cover body 23 on the rear side of the body of motorcycle, a secondary injector 26 is mounted which constitutes an injector of a fuel supply device 25 of in accordance with the present embodiment.

In addition, the cover body 23 is formed, as is shown in figure 2, such that a peripheral portion open bottom end portion is mounted to be installed on the outer side of an open peripheral portion of the body of the box 22.

To be more specific, a mounting portion between the body of the lid 23 and the body of the box 22 is configured in such a way that with respect to both directions, the lateral direction (the direction that is substantially orthogonal to the direction in which the open portion is directed, that is, the front-and-rear direction and the left-and-right direction) and the vertical direction (the direction in which the portion is directed open), the movement of one of them restricts the movement of the other. Since the box body 22 and the cover body 23 of according to this embodiment they are molded using fiber reinforced plastic, the mounting portion can be formed smooth. However, when a mold is used for manufacturing of the bodies of the boxes 22 and of the bodies of the covers 23 On a serial production basis, the mounting portion adopts a structure in which, for example, the entire area of the periphery open the body of the box 22 is formed in such a way that the opening width is greater than the width of other portions that have a staggered portion and the open peripheral portion of the body of the lid 23 has its entire area inserted inside of this enlarged diameter portion. Here a member of seal, such as an o-ring in the mounting portion.

The fuel supply device 25 it is constituted by a primary injector 27 that is mounted on the throttle valve device 14 for each cylinder, by the secondary injector 28 which is mounted on the body of cover 23 for each cylinder, for a fuel pipe assembly 28, which is used to supply fuel from a tank of fuel 10 to these injectors 26, 27 and the like. He fuel supply device 25 according to this embodiment is configured such that it supplies fuel through primary injector 27 over the entire rotating region of engine 1, and fuel is supplied also from the secondary injector 26 when the rotating region of motor 1 is at high load, such as the high rotating region or fast acceleration.

As shown in Figures 1 and 2, the primary injector 27 has an end portion thereof mounted on the wall on the back side of the motorcycle body of the throttle valve device 14 and other portion end is connected to fuel rail 29 and the fuel is injected to the downstream side of the valve throttling 14a. The fuel is supplied under pressure by fuel rail 29 from the fuel tube assembly 28 explained below.

As shown in figure 2, the injector secondary 26 is mounted on an upper wall 23a of the body of cover 23 by means of a support 31 and has an axis thereof aligned with an axis of the air channel 21 (the center line of the passage intake) above the air duct 21. The injector shaft secondary 26 is indicated by a chain line C in the figure 2. In addition, the secondary injector 26 according to this form of embodiment has a lower end portion thereof that injects the fuel arranged in a position that is directed towards the inside of the air duct 21 from above.

Bracket 31, which mounts the secondary injector 26 on the cover body 23, includes, as shown in the Figures 2 and 3, a fuel rail 32 extending in the width direction of the motorcycle along a wall rear 23b of the body of the lid 23, an upper arm 33 which is extends to the front of the motorcycle body at length of the upper wall 23a of the lid body 23 from the fuel rail 32, a lower arm 34 extending towards down and obliquely towards the front side of the body of the motorcycle from fuel rail 32, and a seat of assembly 35, which projects to the front side of the body of the motorcycle from fuel rail 32 laterally to what upper arm length 33.

With respect to fuel rail 32 of support 31, a fuel passage (not shown in the drawing) it is formed inside and the fuel pipe assembly 28 described below is connected to the fuel passage.

The upper arm 33 and the lower arm 34 of the support 31 are provided for each secondary injector 26. With with respect to the upper arm 33, a support 33a, which mounts the portion upper end of the secondary injector 26 there, is formed on an extreme portion of the front side of the motorcycle and at same time, inside a fuel inlet (no shown in the drawing) of the secondary injector 26, which is mounted in the support 33a, a fuel passage 33b is formed to drive the fuel out from inside the lane of fuel 32.

With respect to the lower arm 34 mentioned above, a ring-shaped fold 34a, which fits into a lower portion of the secondary injector 26, is provided in its Extreme portion of the front side of the motorcycle. In this way of embodiment, the lower arm 34 is integrally formed with the fuel rail 32 while on the lower arm 34 is mounted upper arm 33, which is formed separately from the lower arm 34, using fixing bolts 33c (see figure 3) in a state in which the upper arm 33 retains secondary injector 26 in cooperation with the arm lower 34.

With respect to the assembly seal 35 mentioned above, a flat surface 35b that is directed and that is in contact with a lower surface of the upper wall 23a of the cover body 23 is formed around a drill of screw 35a (see figure 3), into which a bolt of fixing 36. Fixing bolt 36 penetrates the upper wall 23a of the cover body 23 from above and is screwed into the screw drill 35a.

With respect to the fuel pipe assembly 28 mentioned above, extreme portions of downstream they are connected, respectively, to the fuel rail 29 on the side of the primary injector 27 and the fuel rail 32 on the side of the secondary injector 26 by means of couplers 37, 38, while top portions of it are connected to a fuel discharge port of a pump fuel (not shown in the drawing) inside the tank of fuel 10. There, the delivery device of fuel 25 according to this embodiment adopts the constitution, in which excessive fuel is returned to the fuel tank 10 from a return hole of fuel 41a (see figure 3) of a pressure regulator 41 connected to fuel rail 29 on the injector side primary 27 by means of a tube not shown in the drawing. He pressure regulator 41 is used, as is well known conventionally, to maintain pressure in a system of fuel at a given pressure.

As the couplers 37, 38 mentioned previously, couplers are used that have a structure that allows couplers 37, 38 to be mounted or disassembled or disassembled without a tool and near the passage of fuel in a state where they are removed from the set of fuel line 28. Coupler 37, which is connected to the fuel rail 32 on the side of the secondary injector 26, is  connected, as shown in figure 2, to the fuel pipe 39, which extends in the vertical direction from above behind the air filter box 12. Here, the coupler 37 and the rail of fuel 32 on the side of the secondary injector 26 are connected by a tube 40 that penetrates the rear wall 23b of the lid body 23.

As described above, agree with the fuel supply device 25 of the engine motorcycle 1 having the constitution mentioned above, the air channel 21 constituting an open end portion of the Admission step is directed inside the box air filter 12 and the secondary injector 26 is mounted on the air filter box 12. Accordingly, when the secondary injector 26, so to speak, in the air in the vicinity of the open end portion of the intake passage, it is not necessary already a member that extends to the upstream side of the admission from the open end portion of the admission step and that supports the secondary injector 26. The support 31, which mounts the secondary injector 26, in the air filter case 12, can be formed to be placed between the secondary injector 26 and the air filter case 12 and therefore the support 31 can be formed compact compared to a mounting piece conventionally used

Accordingly, when the secondary injector 26 in the vicinity of the end portion open the intake passage of the secondary injector 26, this Injector retention can be performed using the clamp 31 light weight and small size compared to the stand conventional injector.

In addition, the secondary injector 26 is mounted integrally on the cover body 23 of the filter housing of air 12 and can be removed from the side of the engine 1 together with the lid body 23. Accordingly, compared to the technique conventional, an operation is no longer necessary to remove the secondary injector mounting member from the device throttle valve 14. Thus, when the secondary injector 26 together with the cover body 23, removing the coupler 37 of the fuel pipe assembly 28 upwards, the withdrawal of the secondary injector 26 can be performed in a state in which most of the supply system of fuel is mounted on the body side of the motorcycle.

In addition, compared to the device conventional fuel supply, in which the piece of Secondary injector assembly is provided on the periphery of the air channel 21, the fuel supply device 25 of according to this embodiment it receives no restrictions by said mounting part in the formation of the filter box of 12 air in the minimum required size. As described in this embodiment, when the air filter case 12 is inserted inside the recessed portion 11 of the reservoir of fuel 10, forming the compact air filter case 12 as described above, it is possible to increase the capacity of the fuel tank 10 compared to the technique conventional.

Additionally, the delivery device of fuel 25 according to this embodiment can open widely the periphery of the air channel 21 and therefore not there is no obstacle that interrupts the intake air that flows into the air channel 21, so that the admission resistance compared to conventional technique.

In addition, the support 31, which mounts the injector secondary 26 in the air filter box 12, has a function of supply fuel to the secondary injector 26 and a function of support the secondary injector 26. Accordingly, when disposes the secondary injector 26 in the vicinity of the air channel 21, are not necessary anymore members that are used exclusively to support the secondary injector 26.

Accordingly, the parts that are used to mount the secondary injector 26 in the air filter housing 12 can be reduced to the greatest extent possible and therefore it is possible to mount the secondary injector 26 in the filter housing 12 air in a more compact way.

Although an example of assembly of the secondary injector 26 in the air filter case 12 in the form of embodiment mentioned above, when mounting a intake silencer that has no filter function on instead of the air filter box 12, it is possible to mount the injector secondary 26 in this intake silencer.

In addition, the aforementioned embodiment previously described the fuel supply device 25, in which the primary injector 27 is mounted on the throttle valve device 14 and at the same time the secondary injector 26 is disposed inside the box of air filter 12. However, teaching this invention is also applicable to the delivery device of fuel that supplies fuel using the injector secondary 26 over the entire area of the rotating region of the engine.

The description above describes (among others things) a fuel supply device of an engine of a motorcycle, in which an injector is arranged in a portion open end of an intake passage, such that an axis of the injector is arranged substantially parallel to a line center of the intake passage, the open end portion of the passage of admission is made directed towards the inside of a box of admission, and the injector is mounted in the intake box.

As described so far, in particular in this embodiment, when the injector is mounted in the proximity of the open end portion of the intake passage, is not necessary already a member that extends to the water side above the admission from the side of the open end portion of the intake passage to support the injector. In addition, since the parts used to mount the injector in a box of intake can be placed between the injector and the intake box placed in the vicinity of the injector, the pieces are Small sized compared to mounting parts They have been used conventionally.

Accordingly, when the injector in the vicinity of the open end portion of the passage of admission, you can restrict the increase in weight in the greater possible measure and at the same time, the cost of manufacturing. Additionally, the injector is integrally mounted on the intake box and can be removed from the side of the engine together with the intake box and therefore can be reduce labor hours for maintenance.

Still additionally, since it is not provided no mounting piece between the intake box and the open end portion of the intake passage, it is possible to form the admission box of a minimum size required without setting No restrictions on the piece mentioned above. Here, when the intake box is inserted inside the portion lowered fuel tank, it is possible to increase the fuel tank capacity compared to technique conventional.

In addition, since it is possible to open widely the periphery of the open end portion of the intake passage, not there is no part that interrupts the air intake flow to the open end portion, so that the intake resistance compared to conventional technique and it It can increase the motor output.

The above description further describes (between other things) a fuel supply device of a motorcycle engine, in which the injector is mounted on a wall that is directed towards the open end portion of the passage of admission in the admission box in an opposite way and you can replace with respect to a wall in which the passage of admission.

In particular, in this embodiment compared to the conventional technique, it is no longer necessary to operation of removing the injector mounting member from the throttle valve device and therefore it You can easily perform maintenance.

The above description further describes (between other things) a fuel supply device of a motorcycle engine, in which the injector is mounted on the intake box by means of a support and the support is configured to form a fuel passage that supplies fuel to the injector inside.

In particular, in this embodiment, the bracket used for mounting the injector in the box intake has the function of supplying fuel to the injector and the function of supporting the injector and, therefore, when assemble the injector in the vicinity of the open end portion of the admission step, the member used is unnecessary exclusively to support the injector.

Accordingly, the number of pieces that are used for mounting the injector in the intake box is can reduce as much as possible and therefore it is possible mount the injector in the intake box one more way compact

Therefore, according to a form of preferred embodiment, particularly to solve the object of the present invention, in a delivery device of fuel from a motorcycle engine, an extreme portion Open one admission step is made directed towards the inside an intake box and an injector is mounted on the admission box.

Accordingly, in the assembly of the injector in the proximity of the open end portion of the passage of admission, it is not necessary anymore a member that extends to a upstream side of the intake from the side of the portion open end of the intake passage to support the injector. In addition, since it is sufficient to form the assembly parts of the injector in the intake box so that the parts are placed between the injector and the intake box placed in the proximity of the injector, the parts are configured small compared to the mounting parts used conventionally.

Said embodiment can be improved. additionally because the injector is mounted on a wall that it is directed towards the open end portion of a step of admission in an admission box in an opposite way and is replaceable with respect to a wall in which the passage of admission.

Accordingly, compared to the technique conventional, an operation to withdraw or disassemble the injector mounting members from the device of throttle valve.

Such embodiments can be improved. additionally because the injector is mounted on the box of admission via a support and the support is configured to form a fuel passage that supplies fuel to the injector inside.

Accordingly, the support that mounts the injector in the intake box has a function of supplying fuel to the injector as well as a function of supporting the injector, so that in the assembly of the injector in the vicinity of the open end portion of the admission passage, they are no longer necessary members that are used exclusively for support the injector.

Therefore, in summary, to simplify the structure that supports a secondary injector provided in the proximity of an open end portion of an intake passage, the open end portion (one air channel 2) of the intake passage is made to go inside a box of air filter 12 and a secondary injector 26 is mounted on the air filter box 12.

Claims (25)

1. Motorcycle comprising a device fuel supply for a multi-cylinder engine that It has a fuel injector for each of the cylinders (6) primary (27) configured to inject fuel to the side of downstream of a throttle valve in a step of admission of the respective cylinder (6) and a fuel injector secondary (26) configured to inject fuel into a portion  Opening end of the cylinder intake passage (6) respective, said opening end portion being directed on an inner side of an air intake box (12) or a intake silencer, where said injector is mounted secondary fuel (26). 2. Motorcycle according to claim 1, wherein said second fuel injector (26) is mounted on an upper body (23) that closes an opening of a upper end portion of a box body (22) of the box admission (12). 3. Motorcycle according to claim 1 or 2, wherein said secondary fuel injector (26) is mounted on a wall (23aa) that is directed towards the portion extreme opening of the intake passage in the intake box (12) or the intake silencer. 4. Motorcycle according to one of the claims 1 to 3, wherein said secondary injector of fuel (26) is mounted on the intake box (12) through of a support structure (31). 5. Motorcycle according to one of the claims 1 to 4, wherein said intake box (12) is mounted on an extreme portion of the upstream side of a throttle valve device (14). 6. Motorcycle according to one of the claims 1 to 5, wherein a fuel tank (10) it is arranged adjacent to the intake box (12), in which a space is defined between a wall member of the box admission and a wall member of the fuel tank. 7. Motorcycle according to claim 6, wherein said fuel tank (10) overlaps said box admission (12). 8. Motorcycle according to one of the claims 1 to 7, wherein the secondary injector of fuel (26) is replaceable with respect to a bottom wall (22aa), which penetrates the admission step (12). 9. Motorcycle according to one of the claims 6 to 8, wherein the lower wall member of the fuel tank (10), which is arranged adjacent to the upper wall member of the intake box (12), is substantially flat and arranged on a level greater than the of the admission box (12). 10. Motorcycle according to one of the claims 6 to 9, wherein the fuel tank (10) comprises a recessed portion (11) to accommodate the intake box (12) there and that is defined by a lower wall member of the fuel tank (10). 11. Motorcycle according to one of the claims 1 to 10, wherein said intake box (12) comprises an upper body (23) in which said secondary injector (26), each being provided with a passage of intake leading to a respective cylinder (6), and a body of box (22) penetrated from below by the intake steps respectively, said lid body (23) and said box body (22) of fiber reinforced plastic material and being detachable from each other. 12. Motorcycle according to one of the claims 2 to 11, wherein the intake box (12) comprises the upper body (23), in which the secondary fuel injector (26), which closes an opening of an upper end portion of the case body (22) mounted on a throttle valve device (14). 13. Motorcycle according to one of the claims 1 to 3, wherein the upper body (23) is configured in a lid form, which opens towards the body of the box (22), and which is replaceably mounted on the body of box (22) by means of a coupling member in a state that the cover body (23) covers an opening portion formed on an upper end of the body of the box (22). 14. Motorcycle according to one of the claims 2 to 13, wherein the delivery device of Fuel (25) for each cylinder comprises the primary injector (27) mounted on a throttle valve device (14) and the secondary injector (26) is mounted on a body upper (23) of the intake box (12), and a fuel tube assembly (28), which is adapted for supply fuel from a fuel tank to these fuel injectors (26, 27). 15. Motorcycle according to claim 14, in which the intake box (14) has in plan view a flat shape bent in a forward direction. 16. Motorcycle according to one of the claims 1 to 15, wherein an air filter element it is arranged in a front portion inside a box body admission (12). 17. Motorcycle according to one of the claims 1 to 16, wherein said primary injectors (27) of the fuel supply device are supplied by a lower common fuel rail (29) and said injectors Secondary fuel supply device are supplied by an upper common fuel rail (32) connected by a connector tube (39) that extends vertically, which extends from above behind the intake box. 18. Motorcycle according to claim 17, in which the connecting tube (39) extends in the direction vertical in the space between the intake box (12) and the tank of fuel (10). 19. Motorcycle according to claim 17 or 18, in which the connecting tube (39) is interposed between the Common upper and lower fuel lanes (32, 29) by coupler means (37, 38). 20. Motorcycle according to claim 19, in which the couplers (37, 38) are of a configured type so that it can be assembled and disassembled without using a tool. 21. Motorcycle according to claim 19 or 20, in which the connecting tube (39) is coupled to the Common upper and lower fuel rail (32, 29) by respective additional tube members (40). 22. Motorcycle according to one of the claims 17 to 21, wherein the primary injectors (27) they supply fuel over the entire area of the rotating region of the engine, while the secondary injectors (26) supply fuel when the rotating region of the engine is loaded high, such as region of high rotation or rapid acceleration only. 23. Motorcycle according to one of the claims 17 to 22, wherein the primary injectors (27) are mounted on a rear side wall of the device throttle valve (14), injecting fuel aside downstream of a throttle valve (14) respective. 24. Motorcycle according to one of the claims 17 to 23, wherein the upper rail of fuel (32) extends in a direction the width of the motorcycle and the lower fuel rail (29) extends in an address the width of the motorcycle and, when looking at The vertical direction of the motorcycle is arranged below a rear wall of the body (22) of the intake box, connecting  the primary injectors (27), respectively. 25. Motorcycle according to one of the claims 17 to 24, wherein the support structure (31), in particular the mounting members of the secondary injectors (26) are fastened with bolts to the upper body wall upper (23).